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added periodic pending tasks counting #1

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87 changes: 73 additions & 14 deletions src/main/java/Main.java
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Original file line number Diff line number Diff line change
Expand Up @@ -12,20 +12,27 @@
import io.netty.channel.epoll.EpollSocketChannel;
import io.netty.channel.kqueue.KQueueEventLoopGroup;
import io.netty.channel.kqueue.KQueueSocketChannel;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.SingleThreadEventExecutor;
import java.text.MessageFormat;
import java.util.AbstractMap;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

public final class Main {

private static void createAndStartGrpServer(int port) throws Exception {
ServerBuilder.forPort(port)
.addService(new MyTestServiceGrpc.MyTestServiceImplBase() {
@Override public void myTest(MyTestProto.Request request, StreamObserver<MyTestProto.Response> so) {
@Override
public void myTest(MyTestProto.Request request, StreamObserver<MyTestProto.Response> so) {
if (request.getValue() == 0) {
so.onNext(MyTestProto.Response.getDefaultInstance());
so.onCompleted();
Expand All @@ -36,18 +43,28 @@ private static void createAndStartGrpServer(int port) throws Exception {
.start();
}

private static ManagedChannel buildChannel(String host, int port, boolean scheduledService) {
private static EventLoopGroup createEventLoopGroup(String suffix) {
ThreadFactory threadFactory =
new ThreadFactoryBuilder().setNameFormat("io-event-loop-%s").setDaemon(true).build();
EventLoopGroup eventLoopGroup;
Class<? extends Channel> channelType;
new ThreadFactoryBuilder().setNameFormat("io-event-loop-" + suffix + "-%s").setDaemon(true)
.build();

if (Epoll.isAvailable()) {
eventLoopGroup = new EpollEventLoopGroup(1, threadFactory);
channelType = EpollSocketChannel.class;
return new EpollEventLoopGroup(1, threadFactory);
} else {
eventLoopGroup = new KQueueEventLoopGroup(1, threadFactory);
return new KQueueEventLoopGroup(1, threadFactory);
}
}

private static ManagedChannel buildChannel(String host, int port, boolean scheduledService,
EventLoopGroup eventLoopGroup) {

Class<? extends Channel> channelType;
if (eventLoopGroup instanceof EpollEventLoopGroup) {
channelType = EpollSocketChannel.class;
} else if (eventLoopGroup instanceof KQueueEventLoopGroup) {
channelType = KQueueSocketChannel.class;
} else {
throw new RuntimeException("unknown EventLoopGroup type");
}

System.out.println("Using " + channelType);
Expand All @@ -73,15 +90,29 @@ public static void main(String[] args) throws Exception {

createAndStartGrpServer(port);

ScheduledExecutorService metricsScheduler = Executors.newSingleThreadScheduledExecutor();

EventLoopGroup eventLoopGroupWithSchedulingLoops = createEventLoopGroup("scheduling");
final MyTestServiceGrpc.MyTestServiceBlockingStub stub = MyTestServiceGrpc.newBlockingStub(
buildChannel(host, port, false));
buildChannel(host, port, false, eventLoopGroupWithSchedulingLoops));

EventLoopGroup eventLoopGroupWithoutSchedulingLoops = createEventLoopGroup("no-scheduling");
final MyTestServiceGrpc.MyTestServiceBlockingStub stubWithScheduledExecutor = MyTestServiceGrpc.newBlockingStub(
buildChannel(host, port, true));
buildChannel(host, port, true, eventLoopGroupWithoutSchedulingLoops));

AtomicInteger pendingTasksWithSchedulingLoops = new AtomicInteger();
AtomicInteger pendingTasksWithoutSchedulingLoops = new AtomicInteger();

metricsScheduler.scheduleAtFixedRate(() -> countPendingTasks(List.of(
new AbstractMap.SimpleEntry<>(pendingTasksWithSchedulingLoops, eventLoopGroupWithSchedulingLoops),
new AbstractMap.SimpleEntry<>(pendingTasksWithoutSchedulingLoops, eventLoopGroupWithoutSchedulingLoops)))
, 10, 10,
TimeUnit.MILLISECONDS);


// Warm-up calls
MyTestProto.Request warmUpRequest = MyTestProto.Request.newBuilder().build();
for(int i = 0; i < 5; i++) {
for (int i = 0; i < 5; i++) {
stub.myTest(warmUpRequest);
stubWithScheduledExecutor.myTest(warmUpRequest);
}
Expand All @@ -92,7 +123,9 @@ public static void main(String[] args) throws Exception {
ExecutorService executorService = Executors.newCachedThreadPool(
new ThreadFactoryBuilder().setNameFormat("main-grpc-request-%d").build());

for(MyTestServiceGrpc.MyTestServiceBlockingStub currentStub : List.of(stub, stubWithScheduledExecutor, stub, stubWithScheduledExecutor, stub, stubWithScheduledExecutor, stub)) {
for (MyTestServiceGrpc.MyTestServiceBlockingStub currentStub : List.of(stub,
stubWithScheduledExecutor, stub, stubWithScheduledExecutor, stub, stubWithScheduledExecutor,
stub, stubWithScheduledExecutor)) {
long totalTimePerExperiments = 0;
for (int i = 0; i < 5; i++) {
CountDownLatch startLatch = new CountDownLatch(1);
Expand Down Expand Up @@ -133,12 +166,38 @@ public static void main(String[] args) throws Exception {
finishLatch.await();

totalTimePerExperiments += totalTime.get();
System.out.println(MessageFormat.format("withScheduledService={0}, testNum={1}, maxTime={2}, minTime={3}, totalTime={4}", currentStub == stubWithScheduledExecutor, i, maxTime, minTime, totalTime));
System.out.println(MessageFormat.format(
"withScheduledService={0}, testNum={1}, maxTime={2}, minTime={3}, totalTime={4}",
currentStub == stubWithScheduledExecutor, i, maxTime, minTime, totalTime));
Thread.sleep(100);
}
System.out.println(MessageFormat.format("withScheduledService={0}, totalTimePerExperiments={1}", currentStub == stubWithScheduledExecutor, totalTimePerExperiments));
System.out.println(
MessageFormat.format("withScheduledService={0}, totalTimePerExperiments={1}",
currentStub == stubWithScheduledExecutor, totalTimePerExperiments));
Thread.sleep(1000);
}

System.out.println(
MessageFormat.format("pending tasks withoutScheduledService={0}, withScheduledService={1}",
pendingTasksWithSchedulingLoops.get(), pendingTasksWithoutSchedulingLoops.get()));

System.exit(0);
}

private static void countPendingTasks(
List<AbstractMap.Entry<AtomicInteger, EventLoopGroup>> pairs) {
for (AbstractMap.Entry<AtomicInteger, EventLoopGroup> pair : pairs) {
pair.getKey().getAndAccumulate(getPendingTasks(pair.getValue()), Math::max);
}
}

private static int getPendingTasks(EventLoopGroup loopGroup) {
int allPendingTasks = 0;
for (EventExecutor eventExecutor : loopGroup) {
if (eventExecutor instanceof SingleThreadEventExecutor executor) {
allPendingTasks += executor.pendingTasks();
}
}
return allPendingTasks;
}
}